Enquiry Of Historical Malfunction; Debugging Function - Gree GUHD09NK3FO Service Manual

Note:
If the unit is not connected to outdoor ambient temperature sensor, display of outdoor ambient temperature
will be shielding after energizing for 12hr.
If there is malfunction of outdoor ambient temperature sensor, display of outdoor ambient temperature will
be shielding after energizing for 12hr.

4.8 Enquiry of Historical Malfunction

malfunction.
malfunctions happened recently. The timer displaying position displays the detailed error code. The 5
malfunction is the last malfunction.

4.9 Debugging Function

Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the debugging
4.9.1 Setting ambient temperature sensor (dual ambient temperature sensors function)
(1). The ambient temperature at air return is set as indoor ambient temperature (timer zone displays 01).
(2). The temperature at wired controller is set as indoor ambient temperature (timer zone displays 02).
(3). Select the temperature sensor at air return in cooling, dry and fan mode; select the temperature sensor
at wired controller in heating and auto mode(timer zone displays 03).
4.9.2 Selecting three speeds in high speed and three speeds in low speed of indoor fan motor
(1). Three speeds in low speed (LCD displays 01)
(2). Three speeds in high speed (LCD displays 02)
Three speeds in low speed include high, medium and low speeds; three speeds in high speed include
super high, high and medium speed.
Note: For this series, this function is invalid.
4.9.3 Displaying setting of freeze protection error code
(1). Displayed (LCD displays 01)
(2). Not displayed (LCD displays 02)
It is defaulted to be not displayed for export unit and be displayed for domestic unit.
4.9.4 Setting refrigerant lacking protection function
(1). With refrigerant lacking protection function (LCD displays 01)
(2). Without refrigerant lacking protection function (LCD displays 02)
4.9.5 Selecting blowing residual heating of indoor unit
(1). Mode 1 (LCD displays 00)
(2). Mode 2 (LCD displays 01)
Note: Blowing residual heating of indoor unit
Mode 1: Unit stops when reaching temperature point and indoor fan motor does not stop in cooling mode;
after unit stops when reaching temperature point in heating mode, duct type unit and floor ceiling unit blow
residual heat for 60s and then stop indoor unit, while cassette type unit always operates in low fan speed and
blows residual heat for 60s when there is malfunction.
Mode 2: After unit stops when reaching temperature point, the indoor fan motor stops operation with a 10s
delay no matter in cooling mode or in heating mode.
4.9.6 Mode selecting of compressor electric heating belt
U-Match Series DC
Inverter Service Manual
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